Example web app that display data using Altair, Vega and VueJS

This is demo I used at PyData Amsterdam 2018.

Setup

To reproduce the content of this demo, you will need a working Python and Node.JS setup. Also, you will need to have Vue installed in your global Node installation:

npm install -g vue-cli

Then you can use vue to instantiate a new application template. We use the more complicated webpack example here as we want to have a running webpack server.

vue init vuetifyjs/webpack altair-app

• In build/webpack.dev.conf.js, we have added disableHostCheck: true so that in development the server is accesible from any hosts. This allows port forwarding to other hosts, e.g. when running from a container.
• In src/App.vue, we have switched the the headings to highlight that this is used in a tutorial at PyData Amsterdam.
• In config/index.js add an entry that will forward to our local Flask app where we will generate the Vega spec using Altair.

  proxyTable: {
    '/vega-example': 'http://localhost:5000'
  },
  

• Install vega-embed using npm install --save vega-embed
• In HelloWorld.vue, we have added a script section that will call our Flask backend that returns the Vega specification using Altair.

Run the javascript part using npm run dev and the Flask backend using FLASK_APP=app.py flask run.